Are they not made of the same substance that fuels solid rocket boosters?

Why the hell would you put that together in your house. One false move with a heat source and bye bye house.

I was incorrect, apparently when you group them together, they become far more sensitive to ignition.

"Sparkler bombs are constructed by binding together as many as 300 sparklers with tape, leaving one extended to use as a fuse. In 2008 three deaths were attributed to the devices, which can be ignited accidentally by heat or friction. Because they usually contain more than 50 milligrams of the same explosive powder found in firecrackers, they are illegal under U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) regulations."

They belong to the same family of compositions, not exactly the same though.

So that's why perihelion came early this year instead of on my birthday like it's supposed to.

Made one when i was a kid, with only a few boxes.. about the size of a cucumber, wound tightly in electrical tape. It was more sound and pressure than fire. Tremendous pressure.. from dozens of meters away, it felt like someone lightly slapped me on the chest. Based on that experience, and the size of this one, I was horrified at how close they were and expected that car to be severely damaged, especially the glass, and them to all be hospitalized.

I guess with a smaller set, there isn't enough opening at the top for all of that pressure to escape, which results in a more explosive reaction. Here that pressure is venting straight up into the air.

Ever wonder what it looks like when the Devil lights his farts?

I'm sure that layer of foil totally saved the pan.

HAHAHAHA! Tin Foil?!

I think I've a new one for the Slo-Mo Guys.

Ok. Our 10,000 sparkler device is ready. Where shall we set it off? I know! How about that field of dry grass next to the forest?

Comment hidden because you are ignoring dag.(show it anyway)

I was expecting an Earth-shattering kaboom.